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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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A functionalizable reverse thermal gel based on a polyurethane/PEG block copolymer.

Daewon Park1, Wei Wu, Yadong Wang

  • 1Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA 15219, USA.

Biomaterials
|October 13, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a new amine-functionalized reverse thermal gel, poly(ethylene glycol)-poly(serinol hexamethylene urethane) (ESHU), for tissue engineering. This biomaterial shows good cytocompatibility and can be modified with peptides for enhanced applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Regenerative Medicine

Background:

  • Injectable reverse thermal gels are promising biomaterials for tissue engineering and drug delivery.
  • Existing gels often lack functional groups for biomolecule modification, limiting cell-material interactions.

Purpose of the Study:

  • To create a novel amine-functionalized ABA block copolymer, poly(ethylene glycol)-poly(serinol hexamethylene urethane) (ESHU), as a versatile biomaterial.
  • To characterize ESHU's thermal gelation, degradation, cytocompatibility, and in vivo response.
  • To demonstrate ESHU's functionalization potential with peptides.

Main Methods:

  • Synthesis and characterization of ESHU using GPC, FTIR, and (1)H FTNMR.
  • Rheological studies to determine gelation properties in phosphate-buffered saline.
  • In vitro degradation tests in PBS and with cholesterol esterase.
  • In vitro cytotoxicity assays with baboon smooth muscle cells.
  • Subcutaneous implantation in rats to assess inflammatory response.

Main Results:

  • ESHU exhibits reverse thermal gelation, transitioning at 32 °C and reaching maximum elasticity at 37 °C.
  • The polymer is hydrolyzable, with degradation accelerated by cholesterol esterase.
  • ESHU demonstrates excellent cytocompatibility with baboon smooth muscle cells.
  • Subcutaneous implantation in rats shows a well-tolerated inflammatory response that resolves over 4 weeks.
  • Functionalization with the IKVAVS peptide results in rapid gelation at body temperature.

Conclusions:

  • ESHU is a functionalizable reverse thermal gel with desirable properties for biomaterial applications.
  • The developed platform offers versatility for tissue engineering and regenerative medicine.
  • Amine functionalization enables peptide conjugation for tailored cell-material interactions.